@article{FPM_2012_17_5_a14,
     author = {O. A. Shpyrko},
     title = {The derived $\pi$-length, nilpotent $\pi$-length, and simple $\pi$-length of finite $\pi$-soluble groups},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {225--235},
     publisher = {mathdoc},
     volume = {17},
     number = {5},
     year = {2012},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_2012_17_5_a14/}
}